CVE-2026-54410
High
Description
nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.
SeverityHigh
CVSS8.6
Exploit probability—
ProductnanoMODBUS
PublishedJun 14, 2026
First seenJun 14, 2026
Weakness typeCWE-193CWE-193CWE-787Out-of-bounds write
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| debevv nanoMODBUS | v ≤ 1.23.0 | — |
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